Exam 4: Motion in Two and Three Dimensions

A stone is thrown outward from the top of a 59.4-m high cliff with an upward velocity component of 19.5 m/s. How long is the stone in the air? Assume that it lands on the ground below the cliff, and that the ground below the cliff is flat.

Velocity is defined as:

Which of the following is a scalar quantity?

Which of the following is NOT an example of accelerated motion?

A ferry boat is sailing at 12 km/h 30 $\degree$ W of N with respect to a river that is flowing at 6.0 km/h E. As observed from the shore, the ferry boat is sailing:

What is the difference between speed and velocity?

A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are:

An object is shot from the back of a railroad flatcar moving at 40 km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:

A stone is thrown horizontally and follows the path XYZ shown. The direction of the acceleration of the stone at point Y is:

For a biological sample in a 1.0-m radius centrifuge to have a centripetal acceleration of 25g its speed must be:

A plane traveling north at 200 m/s turns and then travels south at 200 m/s. The change in its velocity is:

A jet plane in straight horizontal flight passes over your head. When it is directly above you, the sound seems to come from a point behind the plane in a direction 30 $\degree$ from the vertical. The speed of the plane is:

A motor boat can travel at 10 km/h in still water. A river flows at 5 km/h west. A boater wishes to cross from the south bank to a point directly opposite on the north bank. At what angle must the boat be headed?

A particle goes from x = -2 m, y = 3 m, z = 1 m to x = 3 m, y = -1 m, z = 4 m. Its displacement is:

A car rounds a 20-m radius curve at a speed of 10 m/s. The magnitude of its acceleration is:

A projectile is fired over level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g = 10 m/s², the distance from launching to landing points is:

Acceleration is defined as:

A boat is traveling upstream at 14 mph with respect to a river that is flowing at 6 mph (with respect to the ground). A man runs directly across the boat, from one side to the other, at 6 mph (with respect to the boat). The speed of the man with respect to the ground is:

A bomber flying in level flight with constant velocity drops a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true?

A dart is thrown horizontally toward X at 20 m/s as shown. It hits Y 0.1 s later. The distance XY is: